Chapter 12 Structure of Matter Science Study Guide Chapter 12 Structure of Matter

Ch. 12 Word Bank Chemical formula metals periodic table Noble gases neutrons compound groups Chemical symbols protons

1. ______________ use chemical symbols and numbers to show the kinds and numbers of atoms in a compound. Answer: Chemical formulas

2. ________ are usually shiny and bendable. Answer: Metals

3. Elements are arranged by the properties in the _______________. Answer: periodic table

4. _____________ are elements that rarely combine with other elements to form molecules. Answer: Noble gases

5. An element’s _____________ is an abbreviation of its name, sometimes from Latin or Greek. Answer: chemical symbol

6. A _____________is made of two or more elements that are combined chemically. Answer: compound

7. _______________ and ____________ are particles found in the dark region in the atomic model. Answer: Protons neutrons

8. All atoms of an element have the same number of _____ in their nuclei. protons

9. A ______________ requires a chemical reaction to form. Answer: compound

10. In the periodic table, a column is called a __________________. Answer group

11. Carbon substances can have very different properties because ____________ ____________________________________ ____________________________________. Answer: carbon atoms can be arranged in different ways.

12. List 3 properties of metals ___________ ____________________________________ ____________________________________ Answer: shiny, reflect light, bendable, stretchable, and able to conduct electricity and heat.

13. If one of the elements in table salt is a metal, why doesn’t it look or feel like metal? ____________________________________ ____________________________________ Answer: Compounds have different properties than the elements that make them up.

14. Why are compounds called “pure substances” Answer: Every molecule in a compound is like every other molecule and has the same properties.

True or False 15. True or False: The chemical formula for a water molecule is HO2. Answer: False H2O

16. True or False: Each molecule in a compound acts identically to every other molecule of that compound. Answer: True

17. True or False: Water is a compound made up of the two elements. Answer: True

18. True or False Rust is an element of iron and oxygen called iron oxide. Answer: False Rust is a compound

19. How many hydrogen atoms are there in a sucrose (C12H22O11) molecule? _________ Answer: 22

What compound is produced when almost anything containing carbon is burned and is released by your lungs when you exhale? Answer: carbon dioxide (CO2)

Bonus Besides color name 2 physical properties that could be used to tell the differences between 2 metals.

Bonus 2. Explain how rust forms and why rust cannot be washed off.